/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.pinot.core.util;

import java.util.function.Function;
import java.util.function.Supplier;

/**
 * Creates a function which associates generic values with a class and memoizes this association atomically.
 * @param <T>
 */
public class MemoizedClassAssociation<T> extends ClassValue<T> {

  public static <T> Function<Class<?>, T> of(Supplier<T> supplier) {
    return new MemoizedClassAssociation<>(supplier)::get;
  }

  private final Supplier<T> _supplier;

  private MemoizedClassAssociation(Supplier<T> supplier) {
    _supplier = supplier;
  }

  @Override
  protected T computeValue(Class<?> type) {
    return _supplier.get();
  }
}
